JP2014099280A - Vehicle lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that emission light which is not subjected to light distribution control is emitted from a division difference surface, in a conventional vehicle lighting fixture.SOLUTION: A vehicle lighting fixture includes a lens 2 and a semiconductor type light source 3. The lens 2 is composed of one incident surface and emission surfaces 21 to 29 which are divided into nine pieces by division difference surfaces 2L, 2R, 2U, 2D. The lower emission surfaces 24, 25, 26 or 27, 28, 29 of the nine emission surfaces 21 to 29 are located closer to the light emission direction side than the upper emission surfaces 21, 22, 23 or 24, 25, 26. Emission light emitted from the horizontal division difference surfaces 2U, 2D is subjected to light distribution control by the horizontal division difference surfaces 2U, 2D which are inclined downward from the above, is refracted downward with respect to the optical axis of the lens 2 and is emitted.

Description

  The present invention relates to a lens direct illumination type vehicular lamp in which light from a semiconductor type light source is incident on a lens and irradiated from the lens as a predetermined light distribution pattern.

  Conventionally, this kind of vehicle lamp is known (for example, Patent Document 1 and Patent Document 2). Hereinafter, a conventional vehicle lamp will be described.

  The vehicular lamp of Patent Document 1 includes a lens and a light source, and the lens includes an incident surface of a plurality of ring-shaped prisms of a total reflection type Fresnel lens, and an emission surface that is radially divided into a plurality of pieces. It is comprised from. When the light source is turned on, light from the light source enters the lens from the incident surface of the lens, the incident light exits from the exit surface of the lens, and is irradiated to the front of the vehicle as a low beam light distribution pattern.

  The vehicular lamp of Patent Document 2 includes a projection lens and a light source, and the projection lens includes a plurality of divided lens portions that are radially divided around the optical axis. The exit surface has different curvatures, and the entrance surfaces of the plurality of split lens portions are set such that the thickness and focus of the plurality of split lenses are the same. When the light source is turned on, light from the light source enters the plurality of split lens portions from the entrance surfaces of the plurality of split lens portions, and the incident light exits from the exit surfaces of the plurality of split lens portions to obtain a predetermined light distribution The pattern is irradiated in front of the vehicle.

JP 2010-123447 A JP 2012-155902 A

  However, the vehicular lamp of Patent Document 1 is not provided with a means for controlling the light distribution of the emitted light from the divided step surface of the emission surface that is radially divided into a plurality. Further, the vehicle lamp of Patent Document 2 is also not provided with means for controlling light distribution of the emitted light from the divided step surfaces of the outgoing surfaces of the plurality of divided lens portions. For this reason, in the conventional vehicular lamp, emitted light that is not subjected to light distribution control may be emitted from the divided step surface.

  The problem to be solved by the present invention is that in the conventional vehicular lamp, emitted light that is not subjected to light distribution control may be emitted from the divided step surface.

  The present invention (the invention according to claim 1) includes a lens and a semiconductor-type light source, and the lens includes one incident surface and an exit surface divided into a plurality of divided step surfaces. The lower emission surface among the plurality of emission surfaces is positioned closer to the light emission direction than the upper emission surface.

  The present invention (the invention according to claim 2) is characterized in that, among the plurality of emission surfaces, the intermediate emission surface is located on the opposite side to the light emission direction from the left and right emission surfaces. And

  The present invention (the invention according to claim 3) is characterized in that the divided stepped surfaces of the plurality of emission surfaces are provided at a location other than the location where the semiconductor light source is located in the front view of the lens. .

  In the present invention (the invention according to claim 4), the plurality of emission surfaces are divided into at least an intermediate portion, an inner portion of the vehicle, and an outer portion of the vehicle. Emits a condensing light distribution pattern that forms a cut-off line of the low beam light distribution pattern, the exit surface on the inside of the vehicle emits a diffuse light distribution pattern in the middle of the low beam light distribution pattern, and the exit surface on the outside of the vehicle A large diffusion light distribution pattern of a low beam light distribution pattern is emitted.

  In the present invention (the invention according to claim 5), the intermediate exit surface, the exit surface inside the vehicle, and the exit surface outside the vehicle are respectively an upper portion, a central portion, and a lower portion, It is divided into two.

  In the vehicular lamp according to the present invention, the lower emission surface of the plurality of emission surfaces is located on the light emission direction side of the upper emission surface, so that the horizontal division step surface is arranged from the upper emission surface to the lower emission surface. Inclined from top to bottom. As a result, the light emitted from the horizontal division step surface is light distribution controlled by the horizontal division step surface inclined from top to bottom, and is refracted and emitted downward with respect to the optical axis of the lens.

  Further, in the vehicular lamp according to the present invention, since the output surface on the intermediate side among the plurality of output surfaces is located on the light emission direction side with respect to the output surfaces on the left and right end sides, It is inclined from the left side to the right side from the left side, and is inclined from the right side to the left side from the intermediate side outgoing surface to the left end side outgoing surface. As a result, the light emitted from the vertical division step surface is controlled by the vertical division step surface inclined from the left side to the right side and from the right side to the left side, and refracted outward with respect to the optical axis of the lens. Exit.

FIG. 1 shows an embodiment of a vehicular lamp according to the present invention, and is a plan view of a vehicle equipped with left and right vehicular lamps. FIG. 2 is a front view showing the left lamp unit. FIG. 3 is a plan view showing the left lamp unit (viewed in the direction of arrow III in FIG. 2). FIG. 4 is a side view showing the left lamp unit (viewed in the direction of arrow IV in FIG. 2). FIG. 5 is a perspective view showing the left lamp unit. FIG. 6 is an explanatory perspective view showing a semiconductor-type light source. 7 is a horizontal cross-sectional explanatory view showing the optical path from the left lamp unit (a cross-sectional explanatory view taken along the line VIIA-VIIA in FIG. 2, a cross-sectional explanatory view taken along the line VIIB-VIIB in FIG. 2, and a cross-sectional explanatory view taken along the line VIIC-VIIC in FIG. ). 8 is a vertical cross-sectional explanatory view showing the optical path from the left lamp unit (cross-sectional explanatory view taken along line VIIIA-VIIIA in FIG. 2, a cross-sectional explanatory view taken along line VIIIB-VIIIB in FIG. 2, and a cross-sectional explanatory view taken along line VIIIC-VIIIC in FIG. ). FIG. 9 is an explanatory diagram showing an intermediate diffusion light distribution pattern of a low beam light distribution pattern irradiated from the inside (right side) exit surface of the lens of the left lamp unit. FIG. 10 is an explanatory diagram showing a condensing light distribution pattern that forms a cut-off line of a low beam light distribution pattern irradiated from an intermediate exit surface of the lens of the left lamp unit. FIG. 11 is an explanatory diagram showing a large diffusion light distribution pattern of a low beam light distribution pattern irradiated from the exit surface (left side) of the lens of the left lamp unit. FIG. 12 is an explanatory diagram showing an overhead sign light distribution pattern irradiated from the auxiliary lens unit of the left lamp unit. FIG. 13 is an explanatory diagram showing a low beam light distribution pattern irradiated from the lens of the left lamp unit and an overhead sign light distribution pattern irradiated from the auxiliary lens portion of the left lamp unit. FIG. 14 is a vertical partial cross-sectional explanatory diagram (XIV-XIV cross-sectional explanatory diagram in FIG. 2) showing an optical path from a horizontal division step surface of the lens of the left lamp unit. FIG. 15 is a horizontal partial cross-sectional explanatory diagram (XV-XV line cross-sectional explanatory diagram in FIG. 2) showing an optical path from a vertical division step surface of the lens of the left lamp unit. FIG. 16 is an explanatory view showing a light distribution pattern irradiated from the horizontal divided step surface and the vertical divided step surface of the lens of the left lamp unit, and showing the light distribution pattern by computer simulation.

  DESCRIPTION OF EMBODIMENTS Embodiments (examples) of a vehicular lamp according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In FIG. 9 to FIG. 13 and FIG. 16, reference sign “VU-VD” indicates vertical lines on the upper and lower sides of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. In this specification, front, rear, upper, lower, left, and right are front, rear, upper, lower, left, and right when the vehicular lamp according to the present invention is mounted on a vehicle. In the drawing, in the sectional view of the lens, hatching is omitted in order to clarify the optical path.

(Description of Configuration of Embodiment)
Hereinafter, the configuration of the vehicular lamp according to this embodiment will be described. In the figure, reference numerals 1L and 1R denote vehicle lamps (for example, a vehicle headlamp, a low beam headlamp, etc.) according to this embodiment. The vehicle lamps 1L and 1R are mounted on the left and right ends of the front portion of the vehicle C. Hereinafter, the left vehicle lamp 1L mounted on the left side of the vehicle C will be described. Note that the right vehicle lamp 1R mounted on the right side of the vehicle C has substantially the same configuration as the left vehicle lamp 1L (a configuration in which the left and right are substantially reversed), and thus description thereof is omitted.

(Explanation of lamp unit)
The vehicle lamp 1L includes a lamp housing (not shown), a lamp lens (not shown), a lens 2, a semiconductor light source 3, a heat sink member 4, and a holder (mounting member) (not shown). It is to be prepared.

  The lens 2, the semiconductor-type light source 3, the heat sink member 4, and the holder constitute a lamp unit. The lamp housing and the lamp lens define a lamp chamber (not shown). The lamp units 2, 3, and 4 are disposed in the lamp chamber, and are disposed via an up / down direction optical axis adjustment mechanism (not shown) and a left / right direction optical axis adjustment mechanism (not shown). Attached to the lamp housing. In the lamp chamber, lamp units other than the lamp units 2, 3, 4 such as fog lamps, high beam head lamps, low / high head lamps, turn signal lamps, clearance lamps, daytime running lamps, cornering lamps, etc. May be arranged.

(Description of the semiconductor-type light source 3)
As shown in FIGS. 2 to 8, 14, and 15, the semiconductor light source 3 is a self-luminous semiconductor light source such as an LED, an OEL, or an OLED (organic EL) in this example. The semiconductor-type light source 3 includes a package (LED package) in which a light emitting chip (LED chip) 30 is sealed with a sealing resin member. The package is mounted on a substrate (not shown). A current from a power source (battery) is supplied to the light emitting chip 30 via a connector (not shown) attached to the substrate. The semiconductor light source 3 is attached to the heat sink member 4.

  As shown in FIG. 6, the light emitting chip 30 has a planar rectangular shape (planar rectangular shape). That is, four square chips are arranged in the X-axis direction (horizontal direction). Two, three, or five or more square chips, one rectangular chip, or one square chip may be used. Front surface of the light emitting chip 30 In this example, the rectangular front surface forms the light emitting surface 31. The light emitting surface 31 faces the front side of the reference optical axis (reference axis) Z of the lens 2. The center O of the light emitting surface 31 of the light emitting chip 30 is located at or near the reference focal point F of the lens 2 and on or near the reference optical axis Z of the lens 2.

  In FIG. 6, X, Y, and Z constitute an orthogonal coordinate (XYZ orthogonal coordinate system). The X axis is a horizontal axis in the left-right direction passing through the center O of the light emitting surface 31 of the light emitting chip 30, and is outside the vehicle C, that is, in this embodiment, the left side is the + direction and the right side is the-direction. It is. The Y axis is a vertical axis passing through the center O of the light emitting surface 31 of the light emitting chip 30. In this embodiment, the upper side is the + direction and the lower side is the-direction. Further, the Z axis is a normal line (perpendicular) passing through the center O of the light emitting surface 31 of the light emitting chip 30, that is, an axis in the front-rear direction orthogonal to the X axis and the Y axis (reference optical axis of the lens 2). Z), and in this embodiment, the front side is the + direction and the rear side is the-direction.

(Description of lens 2)
As shown in FIGS. 2 to 5, 7, 8, 14, and 15, the lens 2 includes one incident surface 20 and a plurality of nine exit surfaces in this example, that is, a first surface. Output surface 21, second output surface 22, third output surface 23, fourth output surface 24, fifth output surface 25, sixth output surface 26, seventh output surface 27, eighth output surface 28, ninth output surface 29 (hereinafter sometimes referred to as “exit surfaces 21 to 29”). The lens 2 is attached to the heat sink member 4 through the holder so as to face the semiconductor light source 3.

  The front view of the lens 2 (the emission surfaces 21 to 29) has an asymmetric shape. For this reason, the lens 2 uses a dedicated lens for the left vehicle lamp 1L and a dedicated lens for the right vehicle lamp 1R.

(Description of the incident surface 20)
One incident surface 20 is a surface facing the semiconductor-type light source 3, and in this example, is continuously formed by a quadratic curved surface, a composite quadratic curved surface, or a free curved surface.

(Description of emission surfaces 21 to 29)
The exit surfaces 21 to 29 are surfaces opposite to the surfaces facing the semiconductor-type light source 3, and are formed by two vertical division step surfaces 2L and 2R and two horizontal division step surfaces 2U and 2D. It is divided into a total of 9 parts, 3 parts above and below.

  That is, the exit surfaces 21 to 29 are formed by the two vertically divided step surfaces 2L and 2R, the intermediate portions 22, 25, and 28, the inner (right side) portions 21, 24, and 27 of the vehicle C, the vehicle It is divided into three parts 23, 26 and 29 on the outer side (left side) of C. Further, the emission surfaces 21 to 29 are formed by the two horizontal division step surfaces 2U and 2D, so that the upper portions 21, 22, and 23, the central portions 24, 25, and 26, and the lower portions 27 and 28, respectively. , 29 and 3. As a result, the exit surfaces 21 to 29 are divided into 9 parts in total, 3 parts on the left and right, and 3 parts on the top and bottom by the two vertically divided step surfaces 2L and 2R and the two horizontally divided step surfaces 2U and 2D. Has been.

  Of the nine exit surfaces 21-29, the lower exit surfaces 24, 25, 26 or 27, 28, 29 are upper, as shown in FIG. 2, FIG. 4, FIG. 5, FIG. The light exit surfaces 21, 22, 23 or 24, 25, 26 are positioned on the light emission side of the lights L 1 to L 9, L 50 (solid arrow direction side in the figure). In other words, the lens 2 is convex forward of the reference optical axis Z of the lens 2 (forward in the reference optical axis Z direction of the lens 2 and away from the semiconductor light source 3).

  Among the nine exit surfaces 21 to 29, the exit surfaces 22, 25, and 28 on the intermediate side are the exit surfaces 21 on the left and right end sides as shown in FIGS. 2 to 5, 7, and 15. , 24, 27 and 23, 26, 29 are located on the side opposite to the emission direction of the lights L1 to L9, L50 (the side opposite to the solid arrow direction in the figure). That is, the lens 2 is concave on the rear side with respect to the reference optical axis Z of the lens 2 (the rear side in the reference optical axis Z direction of the lens 2 and the direction approaching the semiconductor light source 3).

  In this example, the nine exit surfaces 21 to 29 are formed independently from a free-form surface, a composite quadric surface, or a quadric surface. As shown in FIGS. 3 and 7, the nine exit surfaces 21 to 29 follow the curved slopes (slants) of the left and right ends of the front portion of the vehicle C in FIG. 1 in a plan view of the lens 2. The vehicle C is slanted from the front side to the rear side of the vehicle C from the inner side (right side in this example) to the outer side (left side in this example).

  As shown in FIGS. 10 (A), (B), and (C), the three intermediate second emission surfaces 22, the fifth emission surface 25, and the eighth emission surface 28 are provided with a low beam distribution pattern LP. The condensed light distribution patterns P2, P5, and P8 that form the horizontal cut-off line CL1 and the oblique cut-off line CL2 are emitted.

  The three first emission surfaces 21, the fourth emission surface 24, and the seventh emission surface 27 on the inner side (right side) of the vehicle C are as shown in FIGS. 9A, 9B, and 9C. Then, the middle diffusion light distribution patterns P1, P4, and P7 are emitted from the low beam light distribution pattern LP.

  As shown in FIGS. 11A, 11B, and 11C, the third emission surface 23, the sixth emission surface 26, and the ninth emission surface 29 on the outside (left side) of the vehicle C are as shown in FIGS. The large diffusion light distribution patterns P3, P6 and P9 of the low beam light distribution pattern LP are emitted.

(Description of light distribution patterns P1 to P9)
The light distribution patterns P <b> 1 to P <b> 9 are subjected to light distribution control of light from the semiconductor-type light source 3 by the one incident surface 20 and the nine output surfaces 21 to 29 of the lens 2. The details will be described below.

  As shown in FIG. 10B, the light collection light distribution pattern P5 emitted from the central fifth emission surface 25 is most condensed and left and right with respect to the vertical line VU-VD above and below the screen. The horizontal cutoff line CL1 on the opposite lane side (right side) is positioned below the horizontal line HL-HR on the left and right sides of the screen, and the oblique cutoff line CL2 on the traveling lane side (left side). Crosses the horizontal line HL-HR on the left and right of the screen diagonally.

  The light collection light distribution pattern P2 emitted from the upper second emission surface 22 and the light collection light distribution pattern P8 emitted from the lower eighth emission surface 28 are shown in FIGS. ), The light is slightly diffused vertically and horizontally from the central light distribution pattern P5.

  As shown in FIG. 9B, most of the intermediate diffusion light distribution pattern P4 emitted from the fourth emission surface 24 at the center is distributed rightward with respect to the vertical line VU-VD above and below the screen. The horizontal cut-off line CL1 is located below the horizontal line HL-HR on the left and right of the screen.

  As shown in FIG. 9 (A), the middle diffusion light distribution pattern P1 emitted from the upper first emission surface 21 is slightly diffused vertically and horizontally from the middle middle diffusion light distribution pattern P4. Light is distributed approximately evenly to the left and right with respect to the vertical line VU-VD above and below the screen, and is distributed downward with respect to the horizontal line HL-HR on the left and right of the screen.

  As shown in FIG. 9C, the middle diffusion light distribution pattern P7 emitted from the lower seventh emission surface 27 is slightly diffused up and down than the middle middle diffusion light distribution pattern P4. Almost the same as the middle diffused light distribution pattern P4 at the center, most of the light is distributed to the right side with respect to the vertical line VU-VD on the upper and lower sides of the screen, and the lower side with respect to the horizontal line HL-HR on the left and right side of the screen. The light is distributed.

  As shown in FIG. 11B, the large diffused light distribution pattern P6 emitted from the sixth emission surface 26 at the center is mostly distributed on the left side with respect to the vertical line VU-VD above and below the screen. Most of the light is distributed downward with respect to the horizontal line HL-HR on the left and right of the screen.

  The large diffusion light distribution pattern P3 emitted from the upper third emission surface 23 is mostly distributed to the left side with respect to the vertical line VU-VD above and below the screen, as shown in FIG. The light is distributed downward with respect to the horizontal line HL-HR on the left and right of the screen.

  As shown in FIG. 11C, the large diffusion light distribution pattern P9 emitted from the lower ninth emission surface 29 is slightly diffused up and down than the central large diffusion light distribution pattern P6. In the same manner as the large diffused light distribution pattern P6 at the center, most of the light is distributed on the left side with respect to the vertical line VU-VD on the top and bottom of the screen, and most of the horizontal line HL-HR on the left and right of the screen. Is distributed on the lower side.

(Explanation of divided step surfaces 2L, 2R, 2U, 2D)
The divided stepped surfaces 2L, 2R, 2U, and 2D of the nine exit surfaces 21 to 29 are located where the semiconductor light source 3 is located in the front view of the lens 2 (see FIG. 2). In the inside, it is provided in places other than the place shown with a broken line. The divided step surfaces 2L, 2R, 2U, and 2D are inclined.

  That is, the two horizontally divided stepped surfaces 2U and 2D are formed as shown in FIG. 2, FIG. 4, FIG. 5, FIG. The vehicle C is inclined from the rear side to the front side from the lower emission surface 24, 25, 26 or 27, 28, 29. As a result, the emitted light L50 emitted from the two horizontally divided step surfaces 2U and 2D is inclined from the rear side to the front side of the vehicle C from the top to the bottom as shown in FIG. Light distribution is controlled by the divided step surfaces 2U and 2D, and the light is refracted downward with respect to the optical axis (axis parallel to the reference optical axis Z) Z2 and emitted. In FIG. 14, only the outgoing light L50 emitted from the upper horizontal division step surface 2U is illustrated, but the outgoing light L50 emitted from the lower horizontal division step surface 2D is also directed downward. Refracted and emitted.

  As shown in FIGS. 2 to 5, 7, and 15, the two vertically divided stepped surfaces 2 </ b> L and 2 </ b> R are connected to the output surfaces 21, 24 on the right end side from the output surfaces 22, 25, 28 on the intermediate side. 27 and the exit surfaces 23, 26, 29 on the left end side, the vehicle C is inclined from the rear side to the front side. As a result, the emitted light L50 emitted from the two vertical division step surfaces 2L and 2R is inclined from the rear side to the front side of the vehicle C from the middle to the left and right as shown in FIG. Light distribution is controlled by the divided step surfaces 2L and 2R, and the light is refracted outward with respect to the optical axis (axis parallel to the reference optical axis Z) Z2 and emitted. That is, the outgoing light L50 emitted from the right vertical divided step surface 2R is refracted and emitted rightward, and the outgoing light L50 emitted from the left vertical divided step surface 2L is refracted left and emitted.

  The inclination of the divided step surfaces 2L, 2R, 2U, and 2D substantially matches the draft inclination of a molding die (not shown) of the lens 2. That is, the divided step surfaces 2L, 2R, 2U, and 2D are slightly inclined with respect to the front-rear direction of the vehicle C as shown in FIGS. 7, 8, 14, and 15, the divided step surfaces 2 </ b> L, 2 </ b> R, 2 </ b> U, and 2 </ b> D are illustrated with a large inclination with respect to the front-rear direction of the vehicle C in order to clarify the optical path. It is shown.

(Description of heat sink member 4)
The heat sink member 4 radiates heat generated by the semiconductor light source 3 to the outside. The heat sink member 4 is made of, for example, an aluminum die casting or a resin member having heat conductivity and conductivity. The heat sink member 4 is composed of a vertical plate portion and a plurality of vertical plate-shaped fin portions integrally provided on one surface (rear surface, rear surface) of the vertical plate portion.

  The semiconductor-type light source 3 is attached to a fixed surface of the other surface (front surface, front surface) of the vertical plate portion of the heat sink member 4. The lens 2 is attached to the heat sink member 4 so as to face the semiconductor light source 3 through the holder.

(Description of auxiliary lens unit 5)
An auxiliary lens unit 5 is integrally provided on the lower side of the lens 2. The auxiliary lens unit 5 includes an incident surface 50, a total reflection surface 51, and an exit surface 52. The auxiliary lens unit 5 receives light from the semiconductor-type light source 3 from the incident surface 50, totally reflects the incident light on the total reflection surface 51, and emits the total reflected light from the emission surface 52. Then, the emitted light L10 is irradiated as an overhead sign light distribution pattern P10 shown in FIGS.

  The overhead sign light distribution pattern P10 formed by the auxiliary lens unit 5 is an auxiliary light distribution pattern with respect to the main light distribution pattern of the low beam light distribution pattern LP formed by the lens 2.

(Description of the operation of the embodiment)
The vehicular lamps 1L and 1R according to this embodiment are configured as described above, and the operation thereof will be described below.

  The semiconductor light source 3 is turned on. Then, most of the light from the semiconductor-type light source 3 enters the lens 2 from one incident surface 20 of the lens 2. The incident light exits from the nine exit surfaces 21 to 29 of the lens 2 to the outside. The emitted lights L1 to L9 are irradiated in front of the vehicle C as nine light distribution patterns P1 to P9.

  That is, the emitted light L1 (see FIGS. 7A and 8A) is emitted from the first upper emission surface 21 on the right side, and the vehicle is used as the medium diffusion light distribution pattern P1 shown in FIG. 9A. Irradiated in front of C. Outgoing light L2 (see FIG. 7A and FIG. 8B) is emitted from the middle upper second exit surface 22, and the horizontal cut-off line CL1 and the oblique cut-off line CL2 shown in FIG. The condensed light distribution pattern P <b> 2 is applied to the front of the vehicle C. Outgoing light L3 (see FIG. 7A and FIG. 8C) is emitted from the third upper exit surface 23 on the left side, and a large diffusion light distribution pattern P3 shown in FIG. Irradiated forward.

  Outgoing light L4 (see FIGS. 7B and 8A) is emitted from the fourth central exit surface 24 on the right side, and has an intermediate diffusion light distribution having the horizontal cut-off line CL1 shown in FIG. 9B. The pattern P4 is irradiated in front of the vehicle C. Outgoing light L5 (see FIGS. 7B and 8B) is emitted from the middle fifth outgoing surface 25, and the horizontal cutoff line CL1 and the oblique cutoff line CL2 shown in FIG. The most condensed light distribution pattern P5 that is collected is irradiated in front of the vehicle C. Outgoing light L6 (see FIG. 7B and FIG. 8C) is emitted from the sixth center exit surface 26 on the left side, and the large diffusion light distribution pattern P6 shown in FIG. Irradiated forward.

  Outgoing light L7 (see FIGS. 7C and 8A) is emitted from the lower seventh emission surface 27 on the right side, and the vehicle C is used as a medium diffusion light distribution pattern P7 shown in FIG. 9C. Irradiate in front of. Outgoing light L8 (see FIGS. 7C and 8B) is emitted from the lower middle eighth emission surface 28, and the horizontal cutoff line CL1 and the oblique cutoff line CL2 shown in FIG. The light is emitted in front of the vehicle C as a light collection light distribution pattern P8 having Outgoing light L9 (see FIG. 7C and FIG. 8C) is emitted from the lower ninth exit surface 29 on the left side, and the vehicle C serves as a large diffusion light distribution pattern P9 shown in FIG. Irradiate in front of.

  Here, the intermediate three exit surfaces, that is, the second exit surface 22, the fifth exit surface 25, and the eighth exit surface 28, as shown in FIGS. 10 (A), (B), and (C), The condensed light distribution patterns P2, P5, and P8 that form the horizontal cutoff line CL1 and the oblique cutoff line CL2 of the low beam distribution pattern LP are emitted.

  The three exit surfaces on the inner side (right side) of the vehicle C, that is, the first exit surface 21, the fourth exit surface 24, and the seventh exit surface 27 are shown in FIGS. 9A, 9B, and 9C. As described above, the medium-diffuse light distribution patterns P1, P4, and P7 of the low beam light distribution pattern LP are emitted. The emitted lights L1, L4, and L7 from the first emission surface 21, the fourth emission surface 24, and the seventh emission surface 27 are optical axes (axis parallel to the reference optical axis Z) as shown in FIG. It is distributed at a small angle θ2 (about 25 °) to the outside (inside of vehicle C, right side) with respect to Z1.

  Three exit surfaces on the outside (left side) of the vehicle C, that is, the third exit surface 23, the sixth exit surface 26, and the ninth exit surface 29 are shown in FIGS. 11A, 11B, and 11C. Thus, the large diffusion light distribution patterns P3, P6, and P9 of the low beam light distribution pattern LP are emitted. The emitted lights L3, L6, and L9 from the third emission surface 23, the sixth emission surface 26, and the ninth emission surface 29 are optical axes (axis parallel to the reference optical axis Z) as shown in FIG. It is distributed at a large angle θ1 (about 65 °) to the outside (outside of vehicle C, left side) with respect to Z1.

  By superimposing the nine light distribution patterns P1 to P9, a low beam light distribution pattern LP shown in FIG. 13 is formed. Note that the low beam light distribution pattern LP shown in FIG. 13 is emitted from the left vehicle lamp 1L, and is slightly deviated to the left with respect to the vertical line VU-VD above and below the screen. For example, the vertical line VU-VD above and below the screen is about 60 ° on the left side and about 40 ° on the right side.

  Although the low beam light distribution pattern irradiated from the right vehicle lamp 1R is not shown, the horizontal cut-off line CL1 and the oblique cut-off line CL2 are not changed as compared with the low beam light distribution pattern LP shown in FIG. Is slightly deviated to the right with respect to the vertical line VU-VD. For example, about 40 ° on the left side and about 60 ° on the right side from the vertical line VU-VD above and below the screen.

  The low beam distribution pattern LP shown in FIG. 13 emitted from the left vehicle lamp 1L and the low beam distribution pattern (not shown) emitted from the right vehicle lamp 1R are superimposed, so that the left and right ends are An ideal low beam light distribution pattern (not shown) of about 60 ° on both the left and right sides can be obtained from the vertical line VU-VD on the upper and lower sides of the screen.

  On the other hand, part of the light from the semiconductor light source 3 enters the auxiliary lens unit 5 from the incident surface 50 of the auxiliary lens unit 5. The incident light is totally reflected by the total reflection surface 51 of the auxiliary lens unit 5. The totally reflected light exits from the exit surface 52 of the auxiliary lens unit 5 to the outside. The emitted light L10 is applied to the front upper side of the vehicle C as an overhead sign light distribution pattern P10 shown in FIGS.

  Here, the incident light that has entered the lens 2 is emitted from the divided step surfaces 2U, 2D, 2L, and 2R of the lens 2 through the divided step surfaces 2U, 2D, 2L, and 2R and emitted to the outside. That is, as shown in FIG. 14, the emitted light L50 emitted to the outside from the two horizontal division step surfaces 2U and 2D is subjected to light distribution control by the two horizontal division step surfaces 2U and 2D, and the optical axis (reference The light is refracted downward with respect to Z2 (axis parallel to the optical axis Z) and emitted. Further, as shown in FIG. 15, the emitted light L50 emitted from the two vertical division step surfaces 2L and 2R is light-distributed and controlled by the two vertical division step surfaces 2L and 2R, and the optical axis (reference optical axis). (Axis parallel to Z) refracted outward with respect to Z2 and emitted.

  As a result, the light distribution P0 (hereinafter referred to as “light distribution from the step surface”) P0 formed by the outgoing light L50 emitted to the outside from the divided step surfaces 2U, 2D, 2L, 2R is the light distribution shown in FIG. It becomes. That is, the upper edge is positioned below the horizontal line HL-HR on the left and right of the screen, the central portion is diffused downward, and the left and right end portions are diffused left and right. In particular, the central portion of the upper edge of the light distribution P0 from the step surface (the central portion corresponding to the portion where the vertical line VU-VD on the upper and lower sides of the screen intersects the horizontal line HL-HR on the left and right) is the horizontal line HL on the left and right. -Located below HR.

(Explanation of effect of embodiment)
The vehicular lamps 1L and 1R according to this embodiment are configured and operated as described above, and the effects thereof will be described below.

  The vehicular lamps 1L, 1R according to this embodiment include the lower emission surfaces 24, 25, 26 or 27, 28, 29 among the nine emission surfaces 21-29. 24, 25, and 26 are located on the emission direction side of the lights L1 to L9 and L50. In other words, the lens 2 is convex forward of the reference optical axis Z of the lens 2 (forward in the reference optical axis Z direction of the lens 2 and away from the semiconductor light source 3). For this purpose, the two horizontally divided stepped surfaces 2U, 2D are located above the upper exit surfaces 21, 22, 23 or 24, 25, 26 to the lower exit surfaces 24, 25, 26 or 27, 28, 29. Inclined downward from. As a result, the light distribution L50 emitted from the two horizontal division step surfaces 2U and 2D is subjected to light distribution control by the two horizontal division step surfaces 2U and 2D inclined from top to bottom as shown in FIG. Then, the light is refracted downward with respect to the optical axis (axis parallel to the reference optical axis Z) Z2 and emitted.

  The vehicular lamps 1L and 1R according to this embodiment include the nine exit surfaces 21 to 29, and the exit surfaces 22, 25, and 28 on the intermediate side are the exit surfaces 21, 24, 27, and 23 on the left and right end sides, 26 and 29, it is located on the opposite side to the emission direction of the lights L1 to L9 and L50. In other words, the lens 2 is concave on the rear side with respect to the reference optical axis Z of the lens 2 (the direction behind the reference optical axis Z of the lens 2 and the direction approaching the semiconductor light source 3). For this purpose, the two vertically divided step surfaces 2L, 2R are inclined from the left side to the right side from the intermediate emission surfaces 22, 25, 28 to the right emission surfaces 21, 24, 27, Inclined from the right side to the left side from the emission surfaces 22, 25, 28 to the emission surfaces 23, 26, 29 on the left end side. As a result, as shown in FIG. 15, the outgoing light L50 emitted from the two vertical division step surfaces 2L and 2R is inclined from the left side to the right side and from the right side to the left side. The light distribution is controlled by 2R, and the light is refracted outward with respect to the optical axis (axis parallel to the reference optical axis Z) Z2, and then emitted. That is, the outgoing light L50 emitted from the right vertical division step surface 2R is refracted to the right and emitted, and the outgoing light L50 emitted from the left vertical division step surface 2L is refracted and emitted to the left.

  As described above, in the vehicular lamps 1L and 1R according to this embodiment, the emitted light L50 emitted to the outside from the two horizontally divided stepped surfaces 2U and 2D has an optical axis (reference optical axis) as shown in FIG. As shown in FIG. 15, the outgoing light L50 refracted downward with respect to Z2) (Z2 parallel axis Z) and emitted from the two vertically divided stepped surfaces 2L, 2R has an optical axis ( The light is refracted outward with respect to Z2) (axis parallel to the reference optical axis Z). As a result, the light distribution P0 from the step surface formed by the outgoing light L50 emitted to the outside from the divided step surfaces 2U, 2D, 2L, and 2R becomes the horizontal cutoff line CL1 and the oblique cutoff line CL2 of the low beam distribution pattern LP. On the other hand, the light is distributed downward and outward. That is, as shown in FIG. 16, the center portion of the upper edge of the light distribution P0 from the step surface is located below the left and right horizontal lines HL-HR. Thereby, it is possible to suppress an increase in light distributed upward with respect to the horizontal cutoff line CL1 and the oblique cutoff line CL2 of the low beam distribution pattern LP, or to eliminate light distributed upward. it can.

  In the vehicular lamps 1L and 1R according to this embodiment, since the lens 2 is composed of one incident surface 20, the incident surface of the lens is composed of a plurality of ring-shaped prisms of total reflection type Fresnel lenses. Compared with the vehicular lamp of Patent Document 1, the structure of the incident surface 20 of the lens 2 can be simplified, and the manufacturing cost can be reduced accordingly.

  In the vehicle lamps 1L and 1R according to this embodiment, the divided step surfaces 2U, 2D, 2L, and 2R of the nine emission surfaces 21 to 29 are other than the portion where the semiconductor light source 3 is located in the front view of the lens 2. Compared with the vehicular lamp of Patent Document 2 in which the entrance surfaces and the exit surfaces of the plurality of split lens portions are radially divided about the optical axis, the light source from the semiconductor-type light source 3 is provided. Since the strongest light among the lights does not pass through the divided step surfaces 2U, 2D, 2L, and 2R, there is no loss of light such as refraction, and it can contribute to the light distribution as it is.

  The vehicular lamps 1L and 1R according to the present embodiment include three intermediate exit surfaces, that is, the second exit surface 22, the fifth exit surface 25, and the eighth exit surface 28, as shown in FIGS. As shown in (C), the condensed light distribution patterns P2, P5, and P8 that form the horizontal cutoff line CL1 and the oblique cutoff line CL2 of the low beam distribution pattern LP are emitted. That is, the middle three emission surfaces, that is, the second emission surface 22, the fifth emission surface 25, and the eighth emission surface 28 are the three emission surfaces on the inner side (right side) of the vehicle C, that is, the first emission surface 21, and the first emission surface 21. Compared to the four exit surfaces 24, the seventh exit surface 27, and the three exit surfaces on the outside (left side) of the vehicle C, that is, the third exit surface 23, the sixth exit surface 26, and the ninth exit surface 29, the semiconductor It is located near the mold light source 3. For this reason, the spectral action of the condensed light distribution patterns P2, P5, and P8 formed by the second emission surface 22, the fifth emission surface 25, and the eighth emission surface 28 is the first emission surface 21, the fourth emission surface. 24, the spectroscopic action of the medium diffusion light distribution patterns P1, P4, P7 formed by the seventh emission surface 27, and the large diffusion formed by the third emission surface 23, the sixth emission surface 26, and the ninth emission surface 29. The light distribution patterns P3, P6, and P9 can be suppressed to be lower than the spectral action.

  The vehicular lamps 1L and 1R according to this embodiment have three exit surfaces on the inner side (right side) of the vehicle C, that is, the first exit surface 21, the fourth exit surface 24, and the seventh exit surface 27 as shown in FIG. ), (B), and (C), medium diffusion light distribution patterns P1, P4, and P7 of the low beam light distribution pattern LP are emitted. For this purpose, as shown in FIG. 3, the outgoing lights L1, L4, and L7 from the first outgoing surface 21, the fourth outgoing surface 24, and the seventh outgoing surface 27 are made parallel to the optical axis (parallel to the reference optical axis Z). Can be distributed at a small angle θ2 (about 25 °) to the outside (inside, right side of vehicle C) with respect to Z1. As a result, even if another vehicle structure is arranged inside the vehicle C with respect to the vehicle lamps 1L and 1R, the first emission surface 21, the fourth emission surface 24, and the seventh The outgoing lights L1, L4, and L7 can be emitted from the outgoing surface 27, and loss of light distribution can be eliminated.

  In the vehicle lamps 1L and 1R according to this embodiment, three exit surfaces on the outside (left side) of the vehicle C, that is, the third exit surface 23, the sixth exit surface 26, and the ninth exit surface 29 are illustrated in FIG. ), (B), and (C), the large diffusion light distribution patterns P3, P6, and P9 of the low beam light distribution pattern LP are emitted. For this purpose, as shown in FIG. 3, the outgoing lights L3, L6, and L9 from the third outgoing face 23, the sixth outgoing face 26, and the ninth outgoing face 29 are converted into the optical axis (parallel to the reference optical axis Z). Can be distributed at a large angle θ1 (about 65 °) to the outside (outside of vehicle C, left side) with respect to Z1. Accordingly, when the left and right end portions of the front portion of the vehicle C are curved and slanted from the front side to the rear side from the inner side to the outer side, the third emission surface 23, the sixth emission surface 26, and the ninth emission surface. The outgoing lights L3, L6, and L9 from 29 can be distributed outside at a large angle without being blocked by other vehicle structures.

  As described above, the vehicular lamps 1L and 1R according to this embodiment are provided from the three exit surfaces on the inner side (right side) of the vehicle C, that is, the first exit surface 21, the fourth exit surface 24, and the seventh exit surface 27. Medium diffusion light distribution patterns P1, P4, and P7 of the low beam light distribution pattern LP formed by the emitted lights L1, L4, and L7, three exit surfaces on the outside (left side) of the vehicle C, that is, the third exit surface 23, the first The left and right ends are left and right outside by the large diffused light distribution patterns P3, P6, P9 of the low beam light distribution pattern LP formed by the light beams L3, L6, L9 emitted from the sixth emission surface 26 and the ninth emission surface 29. A widened ideal low beam light distribution pattern (ideal low beam light distribution pattern whose left and right ends are approximately 60 ° on the left and right sides from the vertical line VU-VD on the screen) is obtained.

  In the vehicular lamps 1L and 1R according to this embodiment, the exit surfaces 21 to 29 of the lens 2 are divided into left and right parts by two vertical division step surfaces 2L and 2R and two horizontal division step surfaces 2U and 2D. It is divided into 9 parts in 3 parts. For this reason, it is easy to perform light distribution, light distribution control, and light distribution design in the light distribution patterns P1 to P9 formed by the emitted lights L1 to L9 emitted from the nine emission surfaces 21 to 29.

(Description of example other than embodiment)
In this embodiment, a vehicle headlamp and a low beam headlamp will be described. However, in the present invention, vehicle lamps other than vehicle headlamps and low beam headlamps such as fog lamps and high beam headlamps may be used.

  Further, in this embodiment, a case where the number of emission surfaces 21 to 29 of the lens 2 is nine will be described. However, in the present invention, the exit surface of the lens 2 may be 2 to 8, 10 or more. In this case, if the number of emission surfaces increases, light distribution control becomes easier, but on the other hand, the loss of light from the semiconductor-type light source 3 increases. Further, when the number of emission surfaces is reduced, the loss of light from the semiconductor-type light source 3 can be reduced, but on the other hand, it is difficult to control light distribution. For this purpose, the number of emission surfaces is adjusted in consideration of the loss of light from the semiconductor light source 3 and the light distribution control.

  Furthermore, in this embodiment, the shape of the lens 2 in a front view (outgoing surfaces 21 to 29) is an asymmetric shape. However, in the present invention, the shape of the front view of the lens may be symmetrical, and the lens may be a shared lens for the left vehicle lamp 1L and the right vehicle lamp 1R.

  Furthermore, in this embodiment, the auxiliary lens portion 5 is provided on the lower side of the lens 2 to form the overhead sign light distribution pattern P10. However, in the present invention, an auxiliary lens portion may be provided around the lens 2 to form an auxiliary light distribution pattern other than the overhead sign light distribution pattern P10. Also, a plurality of auxiliary lens portions may be provided to form a plurality of auxiliary light distribution patterns. Further, the auxiliary lens part is not provided and the auxiliary light distribution pattern may not be formed.

1L, 1R Vehicle lamp 2 Lens 20 Entrance surface 21, 22, 23, 24, 25, 26, 27, 28, 29 Exit surface 2L, 2R Vertical division step surface 2U, 2D Horizontal division step surface 3 Semiconductor type light source 30 Light emission Chip 31 Light emitting surface 4 Heat sink member 5 Auxiliary lens unit 5
50 Incident surface 51 Total reflection surface 52 Output surface C Vehicle CL1 Horizontal cut-off line CL2 Oblique cut-off line F Reference focus HL-HR Horizontal horizontal lines on the screen O Center P1, P4, P7 Medium diffuse light distribution pattern P2, P5, P8 Light distribution pattern P3, P6, P9 Large diffusion light distribution pattern P10 Overhead sign light distribution pattern LP Low beam light distribution pattern VU-VD Vertical lines on the screen X X axis Y Y axis Z Reference optical axis (Z axis)

Claims (5)

A lens and a semiconductor-type light source,
The lens is composed of one incident surface and an exit surface divided into a plurality of divided step surfaces,
Of the plurality of exit surfaces, the lower exit surface is located closer to the light exit direction than the upper exit surface.
A vehicular lamp characterized by the above. Among the plurality of exit surfaces, the exit surface on the intermediate side is located on the side opposite to the exit direction of light from the exit surfaces on the left and right end sides,
The vehicular lamp according to claim 1. The divided step surfaces of the plurality of exit surfaces are provided at a location other than the location where the semiconductor light source is located in a front view of the lens,
The vehicular lamp according to claim 1 or 2. The plurality of exit surfaces are divided into at least an intermediate part, an inner part of the vehicle, and an outer part of the vehicle,
The exit surface in the middle emits a light collection light distribution pattern that forms a cut-off line of the low beam light distribution pattern,
The emission surface on the inner side of the vehicle emits a middle diffusion light distribution pattern of the low beam distribution pattern,
The emission surface outside the vehicle emits a large diffusion light distribution pattern of the low beam light distribution pattern,
The vehicular lamp according to any one of claims 1 to 3. The intermediate exit surface, the exit surface inside the vehicle, and the exit surface outside the vehicle are each divided into an upper portion, a central portion, and a lower portion.
The vehicular lamp according to claim 4.

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